--- /dev/null
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_INCLUDE_HARDWARE_HWCOMPOSER_H
+#define ANDROID_INCLUDE_HARDWARE_HWCOMPOSER_H
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+
+#include <hardware/hardware.h>
+#include <cutils/native_handle.h>
+
+__BEGIN_DECLS
+
+/*****************************************************************************/
+/**
+ * The id of this module
+ */
+#define HWC_HARDWARE_MODULE_ID "hwcomposer"
+
+/**
+ * Name of the sensors device to open
+ */
+#define HWC_HARDWARE_COMPOSER "composer"
+
+
+enum {
+ /* hwc_composer_device_t::set failed in EGL */
+ HWC_EGL_ERROR = -1
+};
+
+/*
+ * hwc_layer_t::hints values
+ * Hints are set by the HAL and read by SurfaceFlinger
+ */
+enum {
+ /*
+ * HWC can set the HWC_HINT_TRIPLE_BUFFER hint to indicate to SurfaceFlinger
+ * that it should triple buffer this layer. Typically HWC does this when
+ * the layer will be unavailable for use for an extended period of time,
+ * e.g. if the display will be fetching data directly from the layer and
+ * the layer can not be modified until after the next set().
+ */
+ HWC_HINT_TRIPLE_BUFFER = 0x00000001,
+
+ /*
+ * HWC sets HWC_HINT_CLEAR_FB to tell SurfaceFlinger that it should clear the
+ * framebuffer with transparent pixels where this layer would be.
+ * SurfaceFlinger will only honor this flag when the layer has no blending
+ *
+ */
+ HWC_HINT_CLEAR_FB = 0x00000002
+};
+
+/*
+ * hwc_layer_t::flags values
+ * Flags are set by SurfaceFlinger and read by the HAL
+ */
+enum {
+ /*
+ * HWC_SKIP_LAYER is set by SurfaceFlnger to indicate that the HAL
+ * shall not consider this layer for composition as it will be handled
+ * by SurfaceFlinger (just as if compositionType was set to HWC_OVERLAY).
+ */
+ HWC_SKIP_LAYER = 0x00000001,
+};
+
+/*
+ * hwc_layer_t::compositionType values
+ */
+enum {
+ /* this layer is to be drawn into the framebuffer by SurfaceFlinger */
+ HWC_FRAMEBUFFER = 0,
+
+ /* this layer will be handled in the HWC */
+ HWC_OVERLAY = 1,
+};
+
+/*
+ * hwc_layer_t::blending values
+ */
+enum {
+ /* no blending */
+ HWC_BLENDING_NONE = 0x0100,
+
+ /* ONE / ONE_MINUS_SRC_ALPHA */
+ HWC_BLENDING_PREMULT = 0x0105,
+
+ /* SRC_ALPHA / ONE_MINUS_SRC_ALPHA */
+ HWC_BLENDING_COVERAGE = 0x0405
+};
+
+/*
+ * hwc_layer_t::transform values
+ */
+enum {
+ /* flip source image horizontally */
+ HWC_TRANSFORM_FLIP_H = HAL_TRANSFORM_FLIP_H,
+ /* flip source image vertically */
+ HWC_TRANSFORM_FLIP_V = HAL_TRANSFORM_FLIP_V,
+ /* rotate source image 90 degrees clock-wise */
+ HWC_TRANSFORM_ROT_90 = HAL_TRANSFORM_ROT_90,
+ /* rotate source image 180 degrees */
+ HWC_TRANSFORM_ROT_180 = HAL_TRANSFORM_ROT_180,
+ /* rotate source image 270 degrees clock-wise */
+ HWC_TRANSFORM_ROT_270 = HAL_TRANSFORM_ROT_270,
+};
+
+typedef struct hwc_rect {
+ int left;
+ int top;
+ int right;
+ int bottom;
+} hwc_rect_t;
+
+typedef struct hwc_region {
+ size_t numRects;
+ hwc_rect_t const* rects;
+} hwc_region_t;
+
+typedef struct hwc_layer {
+ /*
+ * initially set to HWC_FRAMEBUFFER, indicates the layer will
+ * be drawn into the framebuffer using OpenGL ES.
+ * The HWC can toggle this value to HWC_OVERLAY, to indicate
+ * it will handle the layer.
+ */
+ int32_t compositionType;
+
+ /* see hwc_layer_t::hints above */
+ uint32_t hints;
+
+ /* see hwc_layer_t::flags above */
+ uint32_t flags;
+
+ /* handle of buffer to compose. this handle is guaranteed to have been
+ * allocated with gralloc */
+ native_handle_t* handle;
+
+ /* transformation to apply to the buffer during composition */
+ uint32_t transform;
+
+ /* blending to apply during composition */
+ int32_t blending;
+
+ /* area of the source to consider, the origin is the top-left corner of
+ * the buffer */
+ hwc_rect_t sourceCrop;
+
+ /* where to composite the sourceCrop onto the display. The sourceCrop
+ * is scaled using linear filtering to the displayFrame. The origin is the
+ * top-left corner of the screen.
+ */
+ hwc_rect_t displayFrame;
+
+ /* visible region in screen space. The origin is the
+ * top-left corner of the screen.
+ * The visible region INCLUDES areas overlapped by a translucent layer.
+ */
+ hwc_region_t visibleRegionScreen;
+} hwc_layer_t;
+
+
+/*
+ * hwc_layer_list_t::flags values
+ */
+enum {
+ /*
+ * HWC_GEOMETRY_CHANGED is set by SurfaceFlinger to indicate that the list
+ * passed to (*prepare)() has changed by more than just the buffer handles.
+ */
+ HWC_GEOMETRY_CHANGED = 0x00000001,
+};
+
+typedef struct hwc_layer_list {
+ uint32_t flags;
+ size_t numHwLayers;
+ hwc_layer_t hwLayers[0];
+} hwc_layer_list_t;
+
+/* This represents a display, typically an EGLDisplay object */
+typedef void* hwc_display_t;
+
+/* This represents a surface, typically an EGLSurface object */
+typedef void* hwc_surface_t;
+
+/*****************************************************************************/
+
+
+typedef struct hwc_module {
+ struct hw_module_t common;
+} hwc_module_t;
+
+
+typedef struct hwc_composer_device {
+ struct hw_device_t common;
+
+ /*
+ * (*prepare)() is called for each frame before composition and is used by
+ * SurfaceFlinger to determine what composition steps the HWC can handle.
+ *
+ * (*prepare)() can be called more than once, the last call prevails.
+ *
+ * The HWC responds by setting the compositionType field to either
+ * HWC_FRAMEBUFFER or HWC_OVERLAY. In the former case, the composition for
+ * this layer is handled by SurfaceFlinger with OpenGL ES, in the later
+ * case, the HWC will have to handle this layer's composition.
+ *
+ * (*prepare)() is called with HWC_GEOMETRY_CHANGED to indicate that the
+ * list's geometry has changed, that is, when more than just the buffer's
+ * handles have been updated. Typically this happens (but is not limited to)
+ * when a window is added, removed, resized or moved.
+ *
+ * a NULL list parameter or a numHwLayers of zero indicates that the
+ * entire composition will be handled by SurfaceFlinger with OpenGL ES.
+ *
+ * returns: 0 on success. An negative error code on error. If an error is
+ * returned, SurfaceFlinger will assume that none of the layer will be
+ * handled by the HWC.
+ */
+ int (*prepare)(struct hwc_composer_device *dev, hwc_layer_list_t* list);
+
+
+ /*
+ * (*set)() is used in place of eglSwapBuffers(), and assumes the same
+ * functionality, except it also commits the work list atomically with
+ * the actual eglSwapBuffers().
+ *
+ * The list parameter is guaranteed to be the same as the one returned
+ * from the last call to (*prepare)().
+ *
+ * When this call returns the caller assumes that:
+ *
+ * - the display will be updated in the near future with the content
+ * of the work list, without artifacts during the transition from the
+ * previous frame.
+ *
+ * - all objects are available for immediate access or destruction, in
+ * particular, hwc_region_t::rects data and hwc_layer_t::layer's buffer.
+ * Note that this means that immediately accessing (potentially from a
+ * different process) a buffer used in this call will not result in
+ * screen corruption, the driver must apply proper synchronization or
+ * scheduling (eg: block the caller, such as gralloc_module_t::lock(),
+ * OpenGL ES, Camera, Codecs, etc..., or schedule the caller's work
+ * after the buffer is freed from the actual composition).
+ *
+ * a NULL list parameter or a numHwLayers of zero indicates that the
+ * entire composition has been handled by SurfaceFlinger with OpenGL ES.
+ * In this case, (*set)() behaves just like eglSwapBuffers().
+ *
+ * returns: 0 on success. An negative error code on error:
+ * HWC_EGL_ERROR: eglGetError() will provide the proper error code
+ * Another code for non EGL errors.
+ *
+ */
+ int (*set)(struct hwc_composer_device *dev,
+ hwc_display_t dpy,
+ hwc_surface_t sur,
+ hwc_layer_list_t* list);
+
+} hwc_composer_device_t;
+
+
+/** convenience API for opening and closing a device */
+
+static inline int hwc_open(const struct hw_module_t* module,
+ hwc_composer_device_t** device) {
+ return module->methods->open(module,
+ HWC_HARDWARE_COMPOSER, (struct hw_device_t**)device);
+}
+
+static inline int hwc_close(hwc_composer_device_t* device) {
+ return device->common.close(&device->common);
+}
+
+
+/*****************************************************************************/
+
+__END_DECLS
+
+#endif /* ANDROID_INCLUDE_HARDWARE_HWCOMPOSER_H */
--- /dev/null
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <hardware/hardware.h>
+#include <hardware/overlay.h>
+
+#include <fcntl.h>
+#include <errno.h>
+
+#include <cutils/log.h>
+#include <cutils/atomic.h>
+
+#include <hardware/hwcomposer.h>
+
+#include <EGL/egl.h>
+
+/*****************************************************************************/
+
+struct hwc_context_t {
+ hwc_composer_device_t device;
+ /* our private state goes below here */
+};
+
+static int hwc_device_open(const struct hw_module_t* module, const char* name,
+ struct hw_device_t** device);
+
+static struct hw_module_methods_t hwc_module_methods = {
+ open: hwc_device_open
+};
+
+hwc_module_t HAL_MODULE_INFO_SYM = {
+ common: {
+ tag: HARDWARE_MODULE_TAG,
+ version_major: 1,
+ version_minor: 0,
+ id: HWC_HARDWARE_MODULE_ID,
+ name: "Sample hwcomposer module",
+ author: "The Android Open Source Project",
+ methods: &hwc_module_methods,
+ }
+};
+
+/*****************************************************************************/
+
+static void dump_layer(hwc_layer_t const* l) {
+ LOGD("\ttype=%d, flags=%08x, handle=%p, tr=%02x, blend=%04x, {%d,%d,%d,%d}, {%d,%d,%d,%d}",
+ l->compositionType, l->flags, l->handle, l->transform, l->blending,
+ l->sourceCrop.left,
+ l->sourceCrop.top,
+ l->sourceCrop.right,
+ l->sourceCrop.bottom,
+ l->displayFrame.left,
+ l->displayFrame.top,
+ l->displayFrame.right,
+ l->displayFrame.bottom);
+}
+
+static int hwc_prepare(hwc_composer_device_t *dev, hwc_layer_list_t* list) {
+ if (list && (list->flags & HWC_GEOMETRY_CHANGED)) {
+ for (size_t i=0 ; i<list->numHwLayers ; i++) {
+ //dump_layer(&list->hwLayers[i]);
+ list->hwLayers[i].compositionType = HWC_FRAMEBUFFER;
+ }
+ }
+ return 0;
+}
+
+static int hwc_set(hwc_composer_device_t *dev,
+ hwc_display_t dpy,
+ hwc_surface_t sur,
+ hwc_layer_list_t* list)
+{
+ //for (size_t i=0 ; i<list->numHwLayers ; i++) {
+ // dump_layer(&list->hwLayers[i]);
+ //}
+
+ EGLBoolean sucess = eglSwapBuffers((EGLDisplay)dpy, (EGLSurface)sur);
+ if (!sucess) {
+ return HWC_EGL_ERROR;
+ }
+ return 0;
+}
+
+static int hwc_device_close(struct hw_device_t *dev)
+{
+ struct hwc_context_t* ctx = (struct hwc_context_t*)dev;
+ if (ctx) {
+ free(ctx);
+ }
+ return 0;
+}
+
+/*****************************************************************************/
+
+static int hwc_device_open(const struct hw_module_t* module, const char* name,
+ struct hw_device_t** device)
+{
+ int status = -EINVAL;
+ if (!strcmp(name, HWC_HARDWARE_COMPOSER)) {
+ struct hwc_context_t *dev;
+ dev = (hwc_context_t*)malloc(sizeof(*dev));
+
+ /* initialize our state here */
+ memset(dev, 0, sizeof(*dev));
+
+ /* initialize the procs */
+ dev->device.common.tag = HARDWARE_DEVICE_TAG;
+ dev->device.common.version = 0;
+ dev->device.common.module = const_cast<hw_module_t*>(module);
+ dev->device.common.close = hwc_device_close;
+
+ dev->device.prepare = hwc_prepare;
+ dev->device.set = hwc_set;
+
+ *device = &dev->device.common;
+ status = 0;
+ }
+ return status;
+}
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